The Saffarids used their capital Zaranj, which is a city in modern-day Afghanistan, as a base for an aggressive expansion eastwards and westwards. They first invaded the areas south of the Hindu Kush in Afghanistan and then overthrew the Persian Tahirid dynasty, annexing Khorasan in 873. By the time of Ya'qub's death, he had conquered the Kabul Valley, Sindh, Tocharistan, Makran (Balochistan), Kerman, Fars, Khorasan, and nearly reached Baghdad but then suffered a defeat by the Abbasids.[5]

The Saffarid empire did not last long after Ya'qub's death. His brother and successor, Amr bin Laith, was defeated at the Battle of Balkh against Ismail Samani in 900. Amr bin Laith was forced to surrender most of his territories to the new rulers. The Saffarids were subsequently confined to their heartland of Sistan, with their role reduced to that of vassals of the Samanids and their successors.

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The dynasty began with Ya'qub ibn al-Layth al-Saffar (Ya'qub, son of Layth, the Coppersmith), a coppersmith who moved to the city of Zaranj. He left work to become an Ayyar and eventually got the power to act as an independent ruler. From his capital Zaranj he moved east into al-Rukhkhadj and Zamindawar followed by Zunbil and Kabul by 865. He then invaded Bamyan, Balkh, Badghis, and Ghor. In the name of Islam, he conquered these territories which were ruled mostly by Buddhisttribal chiefs. He took vast amounts of plunder and slaves from this campaign.[12][13]

Arab armies carrying the banner of Islam came out of the west to defeat the Sasanians in 642 and then they marched with confidence to the east. On the western periphery of the Afghan area the princes of Herat and Sistan gave way to rule by Arab governors but in the east, in the mountains, cities submitted only to rise in revolt and the hastily converted returned to their old beliefs once the armies passed. The harshness and avariciousness of Arab rule produced such unrest, however, that once the waning power of the Caliphate became apparent, native rulers once again established themselves independent. Among these Saffarids of Sistan shone briefly in the Afghan area. The fanatic founder of this dynasty, the coppersmith’s apprentice Yaqub ibn Layth Saffari, came forth from his capital at Zaranj in 870 and marched through Bost, Kandahar, Ghazni, Kabul, Bamyan, Balkh and Herat, conquering in the name of Islam..[14]

The Tahirid city of Herat was captured in 870 and his campaign in the Badghis region led to the capture of Kharidjites which later formed the Djash al-Shurat contingent in his army. Ya'qub then turned his focus to the west and began attacks on Khorasan, Khuzestan, Kerman (Southeastern Iran) and Fars (southwestern Iran).[15] The Saffarids then seized Khuzestan (southwestern Iran) and parts of southern Iraq, and in 876 came close to overthrowing the Abbasids, whose army was able to turn them back only within a few days' march from Baghdad. These incursions, however, forced the Abbasid caliphate to recognize Ya'qub as governor of Sistan, Fars and Kerman, and Saffarids were even offered key posts in Baghdad.[16]

In 901, Amr Saffari was defeated at the battle of Balkh by the Persian Samanids, which reduced the Saffarid dynasty to a minor tributary in Sistan.[17]

In the later 9th century, the Saffarids gave impetus to a renaissance of New Persian literature and culture. Following Ya'qub's conquest of Herat, some poets chose to celebrate his victory in Arabic, whereupon Ya'qub requested his secretary, Muhammad bin Wasif al-Sistani, to compose those verses in Persian.[20]

^"Persian Prose Literature." World Eras. 2002. HighBeam Research. (September 3, 2012);"Princes, although they were often tutored in Arabic and religious subjects, frequently did not feel as comfortable with the Arabic language and preferred literature in Persian, which was either their mother tongue—as in the case of dynasties such as the Saffarids (861–1003), Samanids (873–1005), and Buyids (945–1055)...". [1]

^The Islamization of Central Asia in the Samanid era and the reshaping of the Muslim world, D.G. Tor, Bulletin of the School of Oriental and African Studies, University of London , Vol. 72, No. 2 (2009), 281;"The Saffārids were the first of the Persianate dynasties to arise from the remains of the politically moribund ʿAbbāsid caliphate".

^"First, the Saffarid amirs and maliks were rulers of Persian stock who for centuries championed the cause of the underdog against the might of the Abbasid caliphs." -- Savory, Roger M.. "The History of the Saffarids of Sistan and the Maliks of Nimruz (247/861 to 949/1542-3)." The Journal of the American Oriental Society. 1996

^"The provincial Persian Ya'kub, on the other hand, rejoiced in his plebeian origins, denounced the Abbasids as usurpers, and regarded both the caliphs and such governors from aristocratic Arab families as the Tahirids with contempt". -- Ya'kub b. al-Layth al Saffar, C.E. Bosworth, The Encyclopaedia of Islam, Vol. XI, p 255